Will the mandarins at Beijing weaponize its renminbi in response to President Trump’s tariff threats? That’s the poser from the Times, which reports that “a currency war” could be started by Communist China. Lowering the cost of Chinese exports would be a “powerful tool,” the Times says, against Trump’s envisioned tariffs. It discloses a weakness of the fiat money system: The ability of nations, absent any link to gold, to manipulate their currencies.